/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.planner.expressions

import org.apache.flink.api.common.typeinfo.BasicTypeInfo
import org.apache.flink.table.typeutils.TimeIntervalTypeInfo

case class CurrentRow() extends PlannerExpression {
  override private[flink] def resultType = BasicTypeInfo.LONG_TYPE_INFO

  override private[flink] def children = Seq()

  override def toString = "CURRENT ROW"
}

case class CurrentRange() extends PlannerExpression {
  override private[flink] def resultType = TimeIntervalTypeInfo.INTERVAL_MILLIS

  override private[flink] def children = Seq()

  override def toString = "CURRENT RANGE"
}

case class UnboundedRow() extends PlannerExpression {
  override private[flink] def resultType = BasicTypeInfo.LONG_TYPE_INFO

  override private[flink] def children = Seq()

  override def toString = "UNBOUNDED ROW"
}

case class UnboundedRange() extends PlannerExpression {
  override private[flink] def resultType = TimeIntervalTypeInfo.INTERVAL_MILLIS

  override private[flink] def children = Seq()

  override def toString = "UNBOUNDED RANGE"
}
